Circuit interrupting and protecting device



Jan. 9, 1940.

Filed June 29, 1936 5 Sheets-Sheet 1 0 U z mi 3 m Mi n a; ,A :1 n? W/ pR E N 20 aw a a w w mH ww w 5 I M w r 6 v 5. a f 5 8 w w, &

Jan. 9, 1940. F. B. ADAM ET AL CIRCUIT INTERRUPTING AND PROTECTINGDEVICE Filed June 29, 1936 5 Sheets-Sheet 2 Il l \\\\\\\\\v INVENTORSFREpER/cx B. Hun/v HENRY M 57756111'2 BY W g ATTORNEY.

Jan. 9, 1940. F. B. ADAM ET AL CIRCUIT INTERRUPTING AND PROTECTINGDEVICE Filed June 29, 1936 5 Sheets-Sheet 5 m fl m w v w W M w m H M] n0 M: i m f i: k :5 w

Jan. 9, 1940. F. B. ADAM El AL CIRCUIT INTERRUPTING AND PROTECTINGDEVICE Filed June 29, 1936 5 Sheets-Sheet 4 ll IIVIYIKHIF INVENTORS r nu M a A 3 5 1940- F. a. ADAM El" AL ,186,813

CIRCUIT INTERRUPTING AND PROTECTING DEVICE Filed June 29, 193.6 I 5 Sheets-Sheet 5 ATTORNEY Patented Jan. 9, 1940 UNITED STATES PATENT OFFICECIRCUIT INTERRUPT'ING AND PROTECTING DEVICE poration of MissouriApplication June 29,

19 Claims.

This invention relates to circuit interrupting and protecting devicesand more particularly to an improved safety type pull switch with fuse.

An object of this invention is to provide a 6 safety type of dead frontfuse and switch combination, which by reason of a novel design andconstruction of parts, is unusually compact, has few parts and is easyto assemble, thereby adapting it for application to assemblies ofservice equipment and panelboards.

Another object of this invention is to provide a switch in which theswitch contact blades serve as a means to hold and clamp fuses whichcause the switch contact blades to spread apart and produce a tight fitbetween the switch contact blades and cooperating receiving contacts,thus insuring good electrical contact therebetween.

Another object of this invention is to provide a switch wherein theswitch contact blade receiving parts are entirely covered so that nolive parts are exposed when the switch blades are removed therefrom.

, Another object of this invention is to provide a fuse carrying meansand associated contact block which allows the fuse carrying means to beinserted in the contact block in either one of two positions, the oneposition'causing the fuses in the fuse carrying means to close theassociated circuit contacts and the'other position serving merely as ameans of supporting the fuse carrying means, the circuit contactsremaining open.

. Another object of this invention is to provide switch blades havingportions thereof adapted to receive and hold a fuse which allow easyinsertion and removal of fuses when removed from switch blade receivingcontacts and yetclamp the fuses tightly therein when they are insertedin the receiving contacts, thus. avoiding undesirable heating of thefuse contact parts.

Another object of this invention is to provide a base, either with orwithout side walls, with the proper slots and recesses to maintainswitch blade receiving contacts "in properoperative position withoutadditional securing means; s

Another object of this invention is to provide aco'mbination switchblade receiving part and wire terminal connection which "may be formedon thesame piece of material.

' Another object of this invention is to provide a combination switchblade and fuse supporting meansand associated switch bladereceiving'parts designed for a large capacity fuse,with means to adaptthe same for accommodation of a" smaller REISSUED Feb.l 6,l9h.5.

1936, Serial No. 87,858

capacity fuse and yet prevent the use of a larger fuse therein.

Another object of this invention is to provide a switch blade and fusesupporting means with a handle on the front face thereof which alsoserves to maintain handle supporting members which may be insertedthrough slots in the back face thereof.

Another object of this invention is to provide permanent means forsecuring the switch blades to a supportingmeans which also serve as testpoints.

Another object of this invention is to provide a combination'of amoulded base and housing for the switch receiving contacts with loadextension buses to provide for connection to a similar adjoining contactbase, and to smaller capacity from the following detailed description ofseveral embodiments of the invention.

In the drawings, v

Fig. l is a plan view of an assembled form of the circuit interruptingand protective device;

Fig. 2 is a vertical longitudinal sectional view taken along line 22 ofFig. 1;

Fig. '3 is a vertical longitudinal sectional view taken along line 3-3of Fig. 1; l

Fig. 4 is a cross-sectionalview taken along lin 4-4 of Fig; 2; V

Fig. 5 is a cross-sectional view taken along line 5-5 of Fig. 2; f

Figs. 6,17 and, 8 are vertical cross-sectional views" taken along line66 of Fig. 2. Fig. '6 shows the switch blades inserted in the receivingcontacts whileFig. 'l'shows theni removed from the receiving contactsand Fig. 8 shows the switch blades inserted in dead openings whichjserveto maintain the bladesjand associated supporting means in an offposition;

Fig. 9 is a horizontal sectional view taken along line 9-9 of Flg.f2; HI r Fig. '10 is a perspective view of 'ithe'switch' blade supportingmeans with switch blades secured thereto;

Fig. 11 is a sectional perspective view' of the contact supporting base;I I

Fig. 12 is a perspective view of one-of'the'receiving contacts shownremovedfromthe; supporting has; I. w

' Fig. 13 is a longitudinal sectional view taken along line 13-13 ofFig. 18 of a formof the fuse cutout device provided with branch circuitfuse P u s:

Fig. 14 is a sectional view of a form of the fuse cutout device providedwith switch blades which will accommodate a smaller size fuse than isstandard for the size of receiving contact base shown;

Fig. 15 is a cross-sectional view taken along line 16-16 ofFig. 13;

Fig. 16 is a cross-sectional view taken along line l6--l6 of Fig. 14;

Fig. 17 is a sectional view taken along line 15 iT-l'l of Fig. 18;

Fig. 18 is a partial plan view of two of the fuse cutout devices shownin Fig. 13 located adjacent each other and electrically connected;

Fig. 19 is a cross-sectional view taken along 80 line 19-49 of Fig. 18;

Fig. 20 is a cross-sectional view taken along line 20-20 of Fig. 18;

Fig. 21 is a longitudinal sectional view of an embodiment of thisinvention especially designed 26 for knife blade fuses; and

Fig. 22 is a cross-sectional view taken along line 22--22 of Fig. 21.

The same reference numerals are used to denote similar parts throughoutall of the figures.

80 Referring to the drawings, the numeral 20 indicates a switch bladeformed from a conducting material such as copper and provided with anexpanded or enlarged portion 22 which is shaped to receive and hold afuse terminal 23 which 85 may be inserted therein. The expanded portionsshown in Figs. 1 to 20 are shaped to receive the terminals of a ferruletype fuse. Each switch is provided with end portions 24 and 25 which aresubstantially parallel and adapted to be inserted in receiving contactslater to be described. Tips 26 are provided on the end portions of theswitch blades so that the end portions will fit tightly in receivingcontacts and the enlarged portions 22 will clamp the fuse terminaltightly when the end portions of the switch blades are inserted in thereceiving contacts and the tips of the end portions meet.

The switch blades are secured to a supporting means 21, which may bemoulded from Bakelite so or other insulating material, by rivets 28 inrecesses 30. The rivets 26 may be used asvconvenient test points on thefront of the switch blade supporting means, if desired, as they areavailable to test prongs but not exposed so as to make contact with aperson possible. The switch blade supporting means may be provided witha fin 32 which serves to separate adjoining switch blades of oppositepolarity. A handle may be provided on the. supporting means and is heldin lugs '36 which are inserted in openings 38 in the supporting meansand positioned by extensions 40 thereon and end portions 42 of thehandle. Projections 44 may be provided on the supporting means tomaintain the handle in 55 a partially raised position. Openings 6 may beprovided in the supporting means for ventilating purposes. A contactsupporting base 48 may be provided with side walls 50 to form a boxlikehousing 52, which may be moulded from Bakelite" or other suitableinsulating material. The

"base may be provided with recesses 54 to facilitate ventilation, a fin66, raised portions 58 forming slots 66 along side walls of the housingand raised portions 62 forming a slot 64 on the sup- 7. porting base.Two sets of openings are provided in the supporting base, a set of"dead" openings 65 and a set of "live" openings 66 which overliereceiving contacts 68. The receiving contacts may be formed from a barmember 69 as shown in Fig. 12. and are provided with extruded 5 portionsill which are substantially parallel and are formed from the materialwhich is punched from the opening 12, and a suitable terminal connectionsuch as a threaded hole 14 and screw 16. The receiving contacts aresupported in the 10 openings in the base by overlying portions 18 (seeFigs. 2, 6, '7, 8, 9 and 11) and underlying portions of the base. A slot82, in the base, positions the receiving contact laterally. Screws 84may be provided to be inserted through holes 15 86 in the base to secureit to a panel or wall. Holes 86 are provided in the contact supportingbase to allow the screws 16 to pass therethrough after the receivingcontacts are in place. Normally an electric line 81 is connected to oneset 20 of bar members and a load circuit 89 to the other set of barmembers as shown.

The contact supporting base and side walls forming a complete housingmay be moulded in one piece from some material such as Bakelite. 25 Theslots and openings may be formed in the moulding operation. The contactsmay be easily assembled in the base by inserting them without theterminal screw into the slots in the base and securing them thereto byscrewing down the 3" terminal screw until it passes through the openingsin the base, no other securing means being necessary although in sometypes of construction it may be desirable to secure the receivingcontacts to'the base by some additional means, espe-. 35 cially if adifferent type of terminal connection is used. The switch bladesupporting'means will form a cover for the contact base housing when theswitch blades are inserted in the receiving contacts or the deadopenings. The fin on the, switch blade supporting means slides'in theslots on side walls serving to guide the cover and blades into theproper position and to completely isolate circuits of opposite polarity.The switch 7 blades may be inserted into either of the two 45 sets ofopenings in the base. If the switch blades are in the dead openings, thesupporting means may be pulled out, rotated through degrees and thenpushed into closed position will cause the switch blades to be insertedin the receiving, contacts. A ferrule type fuse'may be inserted endfirst into the enlarged portion of the switch blades to be tightlyclamped therein when the end portions of the switch blades are insertedin the receiving contacts. The presence of a u fuse in the enlargedportion of the switch blades causes the end portions of the switchblades to fit tightly in the receiving contacts and thus to provide verygood electrical contact therebetween.

Fig. 6 shows the blades inserted into the receiving contacts and thuscompleting a circuit through the fuses in the switch blades Fig."'7shows the position of the fin in the guide as well as other parts afterremoval of the switch blades from the contacts. Fig. 8 shows theposition of the parts after the switch blade supporting means or coverhas been rotated 180 degrees from the position shown in Fig. 'l andinserted into the dead openings in the contact base. This latterposition is the "off" position while that. shown in Fig. 6 is the onposition.

The supporting housing is so shaped that a number of such housings maybe placed adjacent each otherv on a panelboard and present a neatappearance. In such an installation it may be .75

desirable to use a uniform size of supporting housings for the sake ofsymmetry and yet to use a smaller size of fuse than can be accommodatedin the corresponding switch blade supporting means. For such use we haveprovided an adaptable type of switch blade as shown .in Figs. 14 and 16,which has the end portions 24 and 25 offset longitudinally from theenlarged portion 22. A smaller size fuse can thus be held between theseswitch blades than if the standard type of blades which have previouslybeen described were used. In order to insure that only the adaptabletype of switch blade and its smaller fuse may be used in the circuit forwhich it is intended, a stop 9I is provided and may be secured to thecontact supporting base by any suitable means as by a screw 92. Thisstop will prevent a large size of fuse from being inserted in a circuitintended to be equipped with a smaller size of fuse.

In many instances it is desirable to provide a pull out switch and fusedevice with fuse sockets for branch circuits. One embodiment of ourinvention so equipped is shown in Figs. 13 and 17, where the numeral 93indicates a plug type fuse supported in a threaded socket 94. A housing95 which may be of moulded bakelite" surrounds the fuse socket and maybe formed so as to be secured on the main contact supporting base 48. Anopening 91 extends through this housing to allow a screw 99, whichserves as one of the contacts for the plug type fuse, to passtherethrough. A bar member IIII similar to the bar member 69, butlonger, is provided with, the receiving contacts 68, a terminalconnection, as a threaded hole I4 and screw III, and a threaded hole I03to support the contact screw 99. A washer I 05 and an insulating washerI01 are placed under the head of the contact screw to clamp a contactstrip I09 to the fuse socket.

The contact strip I 09 projects through an opening II II in the housing,is provided with a wire connection terminal III, and connects the branchcircuit through the plug type fuse to the main fusedn the pull outswitch. A barrier III of insulating material may be provided to separatethe two circuits of each pull out housing as shown in Fig. 18.

It is often desirable to connect two adjacent fuse pull out devices.This may be done as shown in Figs. 18, 19, 20 and Figs. 13 and 17, wherea conductor bar II5 connects the corresponding circuits of adjoiningfuse pull out devices and is secured to the bar members I! by screws II!in threaded holes II9. A barrier I2I of insulating material such as"Bakelite" formed integral with the supporting housing provides thenecessary electrical clearances between parts. The conductor bar H5extends across the top I22 of the contact supporting base. A conductorbar I23 is used to connect the other corresponding circuits of theadjacent pull out devices but passes under the top I22 of the supportingbase ,and is secured by screws I21 in threaded holes I29 in the barsIIlI. Barriers I3I of Bakelite" or other insulating material provide thenecessary electrical clearances between conductors. In order that thestandard type of pull out fuse switch may be used when it is necessaryto connect two adjacent ones, a break out" portion is provided in theside walls of the contact base which, when broken out, leaves openingsI33 through which the lower connecting bus bar connector I23 passes.

When two of the fuse cutout devices are thus placed side by side andconnected as described, it

isusual toconnect the line circuitasshownin. Fig. 13 to the short barmembers of one of the fuse cutout devices. The load circuit 89 may beconnected as shown to the bar members III of the same fuse cutout deviceand may connect to I some distribution center. Additional branchcircuits may be connected to the contacts III of each fuse cutout devicewhile the longer bar members of the adjacent device may be connected toa large load such as an electric stove or ironer. As 1. normally mountedthe plane of the base is mounted vertically and the short or regular barmembers are referred to as the upper bar members while the bar membersIIII are usually beneath the others and are referred to as the lower setof .1. bar members. In Figs. 21 and 22 an embodiment of this inventionespecially useful in connection with knife blade fuses is shown. Theprincipal difference between this and the other types illustrated anddescribed lies in the combination switch and fuse holding blade. In thisembodiment the switch and fuse holding blade I50 which is formed fromsome conducting material such as copper is secured to a ridge 052 of thesupporting means 21 25 by cotter keys I54. Ridges I56 are provided onthe internal sides of the switch blade to make line contact with theknife blade terminal I5! of a fuse I59 which is shown inserted in theblades. The ends of the blades I50 are provided with en- 30 largedportions I 80 to facilitate the insertion of the knife blade fuse. Theinsertion of such a blade into the receiving contacts 68 is facilitatedby humps I62 which may be formed integral with the contact supportingbase 48. This form of 35 the device is used in the same manner as theother form shown except that the fuse is not inserted end first butmerely inserted in the blades as in conventional knife blade fuse clips.

Thus it can be seen that our invention is U adaptable to many differentrequirements and combinations of apparatus. The desirable objectspreviously set forth are achieved by our invention and because of theunique construction employed it is possible to dispense with many of Ithe parts previously used in such devices and yet provide a device whichinsures of satisfactory operation with a minimum of contact heating.

While we have shown but several embodiments of our invention, it will beapparent to those 60 skilled in the art that various changes,modifications, substitutions, additions and omissions may be made in theapparatus described without departing from the spirit and scope of ourinvention as set forth in the appended claims, I I

We claim as our invention:

1. In a fuse cutout switch, switch blades, switch blade receivingcontacts, and a switch blade supporting means, said switch blades beingsecured to said supporting means and having cooperating end portionsextending in a direction substantially perpendicular to the plane ofsaid supporting means and expanded portions adapted to encircle aferrule type fuse terminal the cooperating end portions being offset onthe same side of the center of the expanded portions and arranged toexert pressure against each other when inserted in the receivingcontacts.

2. In a fuse cutout switch, switch blades and 7 switch blade receivingcontacts, said switch blades having end portions thereof adapted to beinserted in the switch blade receiving contacts and other portionsthereof formed to encircle and hold a fuse, the end portions providedwith tips 7 which come together when the end portions are inserted inthe receiving contacts.

3. A fuse cutout switch comprising switch blades and switch bladereceiving contacts. said switch blades having end portions thereofadapted to be inserted in the switch blade receiving contacts and otherportions thereof formed to receive and hold a fuse terminal and to exerta clamping action thereon when the end portions of said switch bladesare inserted in the switch blade receiving contacts, said end portionsarranged to exert pressure against each other when inserted in theswitch blade receiving contacts.

4. A fuse cutout switch comprising switch blades, a supporting meanstherefor, and switch blade receiving contacts, said switch blades beingsecured to said supporting means and having end portions thereofextending in a direction substantially perpendicular to the plane ofsaid supporting means and expanded portions adapted to receive a fuseterminal therein and exert a clamping action thereon when the endportions of said switch blades are inserted in the switch bladereceiving contacts, said expanded portions being substantially fartherapart than said end portions.

5. A fuse cutout switch comprising switch blades, switch blade receivingcontacts and a switch blade supporting means, said switch blades beingprovided with end portions adapted to be inserted in the receivingcontacts and other portions adapted to receive and hold a fuse terminal,said supporting means being provided with slots having handle supportingmembers inserted therein, said handle supporting members having one endextending through the supporting means and the other end enlarged toprevent the entire handle supporting member from passing through theslots and a handle supported by the projecting ends of the handlesupporting members, said handle serving as a positioning means for thehandle supporting members.

6. In a fuse cutout switch, switch blades, 21. supporting meanstherefor, a contact supporting base provided with side walls to form ahousing, switch blade receiving contacts supported by said base, Saidswitch blades being provided with cooperating end portions adapted to beinserted in said switch blade receiving contacts and other portionsformed to encircle a fuse and to exert a clamping action thereon whensaid end portions are inserted in the switch blade receiving contacts,said cooperating end portions being offset on the same side of thecenter of the portion adapted to encircle a fuse, and provided with tipswhich come together when the end portions are inserted in the switchblade receiving contacts, said supporting means cooperating with saidhousing to form a cover therefor when the switch blades are inserted inthe switch blade receiving contacts.

7. A fuse cutout switch comprising a contact supporting base providedwith side walls to form a housing, slots and openings in said base, barmembers having one end thereof shaped to form a switch blade receivingcontact and the other end provided with a wire terminal connection, theslots in said base being adapted to receive and support said bar membersso that the switch blade receiving contacts register with some of theopenings in the base, switch blades and a supporting means therefor,said switch blades having portions adapted to be inserted through saidopenings in the base and into said switch blade receiving contacts andother portions adapted to hold a fuse and to exert a clamping actionthereon when said switch blades are inserted in said switch bladereceiving parts.

8. A fuse cutout switch comprising a fixed contact supporting means,receiving contacts supported thereby, switch blades, and a switch bladesupporting means, said switch blades being provided with end portionsadapted to be inserted in said receiving contacts and other portionsadapted to hold a fuse terminal and exert a clamping action thereon whensaid switch blades are inserted in the receiving contacts, said endportions being spaced apart a distance substantially less than thediameter of a fuse terminal adapted to be held in the switch blades.

9. A fuse cutout switch comprising a fixed contact supporting means,slots and openings therein, bar members having one end shaped to form aswitch blade receiving contact and the other end provided with a wireterminal connection, said slots being adapted to receive and support thebar members so that the switch blade receiving contacts register withsome of the openings in the fixed contact supporting means, switchblades and a supporting means therefor, said switch blades having endportions adapted to be inserted in the switch blade receiving contactsand other portions adapted to receive and hold a fuse terminal.

10. A fuse cutout switch comprising a contact supporting means, slotsand openings therein, bar members having one end shaped to form a switchblade receiving contact and the other end provided with a wire terminalconnection, said slots being adapted to receive and support said barmembers so that the switch blade receiving contacts register with someof said openings in the contact supporting means, switch blades and asupporting means therefor, said switch blades having end portionsadapted to be inserted in said switch blade receiving contacts and otherportions adapted to receive and hold a fuse, and exert a clamping actionthereon when the end portions of said switch blades are inserted in saidswitch blade receiving contacts.

11. A fuse cutout switch comprising a contact supporting means, slotsand two sets of openings therein, switch blade receiving contactssupported by said contact supporting means and registering with one ofsaid sets of openings, switch blades and a supporting means therefor,said switch blades being provided with end portions adapted to beinserted into either of said sets of openings and other portions adaptedto hold a fuse and exert a clamping action thereon when said switchblade end portions are inserted through the set of openings registeringwith the switch blade receiving contacts and into the switch bladereceiving contacts, the set of openings not registering with said switchblade receiving contacts being adapted to support the switch blades-andswitch blade supporting means when inserted therein, yet not allowingthe switch blades to engage with the switch blade receiving contacts.

12. A fuse cutout switch comprising a contact supporting means, slotsand two sets of openings therein, switch blade receiving contactssupported by said contact supporting means and registering with one ofsaid sets of openings, switch blades and a supporting means therefor,said switch blades being provided with end portions adapted to beinserted into either of said sets of openings and other portions adaptedto hold a fuse and exert a clamping action thereon when said switchblade end por ions are inserted through the set of openings registeringwith the switch blade receiving contacts and into the switchblade-receiving contacts.

. 13. A switch contact supporting means comprising a base provided withopenings therethrough, portions of said base overlying some of the sidesof the opening, other portions of said base underlying other of thesides of the opening, the overlying and underlying portions of said basebeing of such thickness and so separated as to form slots therebetweenadapted to accommodate a bar member and maintain it in position againstmovement transverse to the base, the portion of the opening not coveredby either the overlying or underlying portions of said base beingadapted to register with a switch receiving contact on a bar member.

14. A switch comprising a contact housing provided with a base and sidewalls therefor, bar members provided with switch receiving contacts onone end thereof, openings in said base, portions of said base overlyingsome of said openings, portions of said base underlying the sameopenings, said overlying and underlying portions of said base beingspaced and of such thickness as to form a slot therebetween adapted toaccommodate said bar members, the portion of said base not covered byunderlying or overlying portions registering with the switch receivingcontact on the bar members, a switch blade supporting means, and switchblades secured thereto and adapted to be inserted through openings inthe base and into the switch receiving contacts on the bar member.

15. A fuse cutout switch comprising switch blades and a supporting meanstherefor, said switch blades having end portions thereof adapted to beinserted in fixed switch contact receiving parts and other portionsadapted to receive and hold a knife blade terminal of a fuse and toexert a clamping action thereon when the end portions of said switchblades are inserted in fixed switch contact receiving parts, said endportions being formed so as to come together beneath the switch bladereceiving parts.

16. A switch blade contact receiving part comprising a bar memberpfconducting material, spaced parallel portions thereof extending in adirection perpendicular to the plane of the bar member, an opening inthe bar member between said spaced parallel portions, the length of eachof said spaced parallel portions being not greater than one-half thewidth of said opening plus the thickness of the bar member.

17. A switch blade contact receiving part comprising a bar member ofconducting material, spaced parallel portions extended therefrom in adirection perpendicular to the plane of the bar member to form .anopening at one end of the bar member between said spaced parallelportions, and a wire terminal connector formed on the other end of saidbar member.

18. A fuse cutout switch comprising switch blades, a switch bladesupporting means, a contact supporting base, straight slots in saidbase, bar members provided with switch blade receiv-' ing contactssupportedby underlying and overlying portions of the base, plug fusesockets supported by said base and having one contact thereofelectrically connected to said bar members, the switch blades beingprovided with portions thereof adapted to receive and hold a fuseterminal and to exert a clamping action thereon when said switch bladesare inserted in the switch blade receiving contacts.

19. In a fuse cutout switch, a contact supporting base, two pair ofoppositely disposed openings through said base, bar members partiallydisposed in said openings and positioned by extensions of the base aboveand below said openings, said bar members provided with switch bladereceiving contacts adjacent the end positioned in the openings andterminalconnections adjacent the other end, a pair of fuse socketspositioned above one pair of bar members between the switch bladereceiving contact and the terminal connection and electrically connectedthereto.

FREDERICK B. ADAM.

mnmr M. smonrrz.

DISCLAIMER 2,186,813.Freden'elc B. Adam, St. Louis County, and Hen M.Stieglitz, St. Loni: Mo. CIRCUIT INTERRUPTING AND Pno'rnc'rmo lDnvrca.Patent date January 9, 1940. Disclaimer filed October 31, 1941, by theassignei Frank Adam Electric Company. Hereby disclaims: From claim 13all switch contact supporting means, except where the portio1 of theopening not covered by either the overlying or underlying portions of thbase, and which is adapted to 1' star with a switch receiving contact,is boundei in part by an overlying portion and bounded in another partby an underlyin portion; 7

From the scope of claim 14 all switches exce t those in which the bar isositionei laterally by engagement with opposite side walls of the oening, and the ar is als positioned in the transverse direction byengagement wit the overlying and under ying ortions of the base;

rom the scope of claim 18 all fuse cut-out switches, except those inwhich thl bar is positioned laterally by engagement with the o positeside walls of the straighi slot, and the bar is also positioned m thetransverse irection by engagement with tlM overl g and underlyingportions of the base;

rom the scope of claim 19 all fuse cut-out switches, except those inwhich tht bar member is positioned laterally by engagement with oppositeside walls of the opening, and. the bar member is also positioned in thetransverse direction by engagement with the extensions of the base aboveand below said opening.

[Qflic'ial Gazette November 25, 1941] DISCLAIMER 2,186,813.Frederick B.Adam, St. Louis County, and Hem-3113M. Stieglitz, St. Louis, Mo. CIRCUITINTERRUPTING AND Pno'rnc'rmc EVICE. Patent dated January 9, 1940.Disclaimer filed October 31, 1941, by the assignee, Frank Adam ElectricCompany. Hereby disclaims: V From claim 13 all switch contact supportingmeans, except where the portion .of the opening not covered by eitherthe overlying or underlying portions of the base, and which is adaptedto register with a switch receiving contact, is bounded in part by anoverlying portion and bounded in another part by an underlying portionFrdm the scope of claim 14 all switches exce t those in which the bar isositioned laterally by engagement with opposite side w of the o ening,and the ar is also ym ortions of the base;

rom the scope of claim 18 all fuse cut-out switches, except those inwhich the bar is positioned laterally by engagement with the o positeside walls of the straight slot, and the bar is also positioned 1n thetransverse direction by engagement with the overllying and underlyingportions of the base;

rom the scope of claim 19 all fuse cut-out switches, except those inwhich the bar member is positioned laterally by engagement with oppositeside walls of the opening, and the bar member is also positioned in thetransverse direction by engagement with the extensions of the base aboveand below said opening.

[Qflicial Gazette November 25, 1941] positioned in the transversedirection by engagement wi the overlying and under-

